Blaine, this is for you:
I was looking through one of Ash's cookbooks today, and what do I see?
"75 g Rocket"
That's right. The Spaniards didn't just have a bad translation on that menu. Someone, somewhere, actually calls arugula "rocket", and there's enough of them doing it that it's in a cookbook. Of course I had to look it up, and
http://en.wikipedia.org/wiki/Arugula has it mentioned.
"The term arugula (from Italian dialect arigola) is found chiefly in the U.S.; both words arugula and rocket ultimately come from Latin eruca."
I really wanted to run and show you, but the best I can settle for is posting it on LiveJournal.